Analysis Of Whole Field Fluid Field And Thermal Effect Of Compact Medium High Voltage Motor

With the increase of the capacity of the motor,the electromagnetic load is increasing,which makes the heating problem become more and more serious.Compared with the medium-sized high voltage motor(YKK Series),the compact medium high voltage motor(YJKK Series)has an average reduction of two grades in the same capacity motor center.The electromagnetic load is larger and the power density is higher.It is necessary to further study the heating and cooling to ensure the safe and stable operation of the motor.Taking the YJKK 500-4 2500 k W compact medium-sized high voltage motor as an example,combined with the internal structure of the motor and the actual size,the method proposed in this dissertation by using the field circuit combined with the flow-heat synergy mechanism based on the graph according to pressure fluid network the size of the motor of the external and internal ventilated path is divided into 7 regional pressure etc.The appropriate basic assumptions and suitable boundary conditions are selected to connect the different regions.By using the flow-heat synergistic mechanism,the modeling and calculation analysis of the internal and external ventilated paths are carried out,and the fluid flow and thermal effect in each area of the internal and external ventilated paths are obtained.The correctness and accuracy of the method used in this paper are verified by the test results of the internal and external ventilated path combined with the test results.The analysis of the external ventilated path shows that the closer the leaf edge is,the larger the linear velocity of the fluid on the surface of the blade is,the maximum speed is 38.6 m/s,and the cooler temperature is higher on the left side than the right side.But the cooling effect of the external ventilated path is not very ideal.Combined with the knowledge of fluid mechanics and heat transfer,the optimization measures are put forward and themodeling calculation is carried out.Through analysis and calculation results of fluid flow in internal ventilated path,flow distribution data of 1-14 are obtained: the ventilation duct is close to the wind road exit,the internal flow distribution is relatively more.Based on the results of the fluid distribution in the internal ventilated path,the calculation model of the flow-solid coupling in the stator and rotor area is established,and after iterative calculation,the highest temperature was obtained in the stator of the motor,and the maximum temperature is 115 ?,and the accuracy of the calculation results is verified through experiments.Based on the analysis of fluid flow and heat effect in the stator and rotor region,some optimization suggestions for fluid flow and heat transfer of fixed rotor are put forward,so as to point out some reasonable reference schemes for improving the capacity of motor in the condition of keeping the motor size unchanged.